Fix case where a theme slug is all non-latin characters #1814
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Fixes #1771
Adds a special case when it creates a class for the slug. If it has all non-latin characters, it would previously return an empty string and fail. Now it creates a slug using a hex representation of the characters if the string would otherwise be empty.
Also needed to force a UTF-8 encoding when parsing the theme's style.css to get the information. This was a fun bug to track down... 🙃